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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
This is obviously solutions from someone familiar to c++ but not Ruby.
O(n) will be no matter 1 or 2 or 100 times you're iterating over a string, its still linear
definetely a bad practice